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Related Concept Videos

Complement System01:27

Complement System

2.5K
The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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Overview of Hematopoiesis01:20

Overview of Hematopoiesis

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Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs).
Developmental Phases of Hematopoiesis
Initially, HSCs are formed in the embryonic yolk sac, a critical site for early blood cell production. These stem cells subsequently migrate to other...
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Hematopoiesis01:21

Hematopoiesis

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The process of blood cell formation is called hematopoiesis. Hematopoiesis starts early during development, on the seventh day of embryogenesis. This phase of hematopoiesis is called the primitive wave, wherein the extraembryonic yolk sac allows the production of erythroid cells and endothelial cells from a common precursor called hemangioblast. The erythroid cells provide oxygen to support the growth of the rapidly dividing embryo. Hemangioblasts later develop into hematopoietic stem cells or...
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Role of Hematopoietic Growth Factors01:28

Role of Hematopoietic Growth Factors

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Hematopoietic growth factors are molecules that regulate the differentiation rate of hematopoietic stem cells (HSCs). Erythropoietin (EPO), primarily produced by the kidneys, plays a crucial role in erythrocyte production. When oxygen levels in the blood are low, EPO is released into the bloodstream, reaching the bone marrow, where it stimulates HSCs to differentiate and mature into erythrocytes, which are vital for oxygen transport.
Thrombopoietin (TPO), mainly released by the liver,...
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Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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Complementation Tests00:49

Complementation Tests

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A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
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Related Experiment Video

Updated: Aug 13, 2025

Depletion of Specific Cell Populations by Complement Depletion
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Depletion of Specific Cell Populations by Complement Depletion

Published on: February 5, 2010

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Complement biology for hematologists.

Anna Duval1,2, Véronique Frémeaux-Bacchi1,3

  • 1Centre de Recherche des Cordeliers, Inserm UMR S1138, Paris, France.

American Journal of Hematology
|January 23, 2023
PubMed
Summary
This summary is machine-generated.

The complement system, crucial for innate immunity, plays a role in hematological diseases. Novel complement inhibitors offer new hope for treating these conditions, including paroxysmal nocturnal hemoglobinuria (PNH) and atypical hemolytic uremic syndrome (aHUS).

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Last Updated: Aug 13, 2025

Depletion of Specific Cell Populations by Complement Depletion
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Area of Science:

  • Immunology
  • Hematology

Background:

  • The complement system is a key component of innate immunity.
  • Dysregulation of complement activation is implicated in various hematological disorders.
  • Recent advances in complement inhibition have transformed treatment for paroxysmal nocturnal hemoglobinuria (PNH) and atypical hemolytic uremic syndrome (aHUS).

Purpose of the Study:

  • To review complement system biology.
  • To explore complement activation mechanisms in hematological diseases.
  • To highlight the therapeutic potential of complement inhibitors in hematology.

Main Methods:

  • Literature review of complement system function.
  • Analysis of complement's role in hematological disease pathogenesis.
  • Examination of clinical data for anti-C5 therapies and complement inhibitors.

Main Results:

  • Complement system dysregulation is a significant factor in hematological diseases.
  • Anti-C5 therapies have markedly improved outcomes for PNH and aHUS.
  • A growing pipeline of complement inhibitors shows promise for broader hematological applications.

Conclusions:

  • The complement system is a critical target in hematological diseases.
  • Targeted complement inhibition represents a paradigm shift in managing PNH and aHUS.
  • Further research into complement pathways may yield novel therapies for diverse hematological conditions.